TR201806769T4 - Lighting device with versatile light distribution. - Google Patents

Abstract

An illumination device 2 includes a light source 210 having a main forward emission direction 20 and a jacket 220 in which the light source 210 is arranged. The sheath 220 includes an upper portion 225 having scattering properties and arranged laterally and backwardly to reflect a portion of the light from the light source 210 and transmitting a portion of the light from the light source 210 relative to the main forward emission direction 20. . The light intensity distribution of the lighting device 2 is more uniform because the back and lateral light intensity increases while the light in the main forward emission direction 20 is still accepted.

Description

DESCRIPTION LIGHTING DEVICE WITH VERSATILE LIGHT DISTRIBUTION FIELD OF THE INVENTION The present invention is generally used to reflect light laterally and backwards. relates to the field of lighting devices with means such that a developed light intensity distribution is obtained. PRIOR ART In conventional LED-based lighting devices, the light source is basically a lateral and directs the light with a higher light intensity than backwards, the light part of the light emitted by the light source where the source is mounted shade it. To achieve a more versatile light intensity distribution and so to better resemble a traditional bright electric light bulb, the light It is desirable to increase the density laterally and backwards.

Document CN101275731 is arranged at the top of a sleeve surrounding an LED indicates an LED-based lighting device with a reflector. Reflector, from the LED* to increase the light intensity behind the lighting device. reflects some of the light laterally and backwards. With such lighting devices A related problem is that some of the light emitted from the LED reflector is the main forward emission. As it is blocked by the reflector in the direction of dark field provision. an encapsulant with scattering properties to fit the emission pattern, and Describes a light emitting device that has the color temperature uniformity of the output profile.

The encapsulant is formed with materials with light scattering properties. this light 3628933 the density of the scatterers, inside the encapsula and/or the surface of the encapsula changes spatially.

JP document, for example: devices emitting solid light such as light sources and a heat sink or a holder for coating solid light emitting devices describes a lamp containing a dome-shaped bulb attached to it. of the bulb a beam of light emitted from solid light-emitting devices on its entire or partial inner surface. reflecting part of the light emitted from devices that transmit part of it and emit solid light A semi-transparent layer is formed.

BRIEF DESCRIPTION OF THE INVENTION An aim of the present invention is to solve these problems and achieve a more uniform light. is to provide a lighting device with a density distribution. In particular, available One object of the invention is to provide a room with a reduced dark area at the top of the sheath. These and other aspects of the present invention are in a way as defined in the independent claims. obtained with the lighting device. Applications of the invention in dependent claims is defined.

According to one aspect of the present invention, a lighting device is provided. Lighting The device consists of a light source with a main forward emission direction and Includes a cover in which it is arranged. The sheath is a light that has scattering properties. radiates some of the light from the source laterally with respect to the main forward emission direction. and to reflect back and reflect some of the light from the light source includes a superposition arranged to transmit.

With the present invention, the light intensity of the lighting device is changed from the upper part light source. scattering properties that reflect (or divert) some incident light in these directions. Since it has, it is increased in the lateral and backward directions. Besides, the top 3628933 the part also transmits some of the light from the light source out of the sheath, so that the top part (just like the rest of the cover) can appear bright.

The present invention is more uniform in light intensity distribution. advantageous because the main still receives the light in the forward emission direction, while the backward lateral light intensity is increased. Furthermore, the upper part is instead of blocking all the light. visible darkness, as obtained in the previous art, while transmitting some of the light the area is reduced and preferably removed. Especially LED-based lighting devices for the LED light source, lateral and backward (ie relative to the main forward emission direction a higher light than along a lateral direction or a backward direction) forward (i.e. along the main forward emission direction) with the intensity distribution provides a directed light, so that some of the light is directed towards the LED] or by backward scattering. With the present invention, view of the lighting device as well as the light distribution (which is more versatile) (a reduced visible dark area) more like that of a bright electric light bulb Also, the present invention is that the upper part regenerates some of the light by scattering. orientation, thus obtaining the diffuse reflection and transmittance of the light and illuminated as well as the transition between the top and the lateral part of the sheath It is advantageous in terms of reducing the visible sharp edges in the circles. The scattering in the upper part of the striking light, the light transmitted through the upper part also as it can be slightly redirected (but forward) due to scattering can scatter light in the direction of forward emission. Therefore, your light is sideways or backwards diffused transmission of light obtained by diffuse reflection and scattering in the upper part, light make the distribution of density smoother both in the near field and in the far field. brings. Another advantage of the present invention is that the scattering properties (and the upper part) it can be integrated into the sheath, so that it can be placed in a separate bag as in the previous techniques. Manufacturing using several components compared to when the reflector is used It facilitates the assembly of the lighting device during 3628933 In the present disclosure, the term "top of the sheath" refers to the main forward emission from the light source. It may refer to a part of the sheath struck by the light that radiates greatly in the direction of.

Preferably, the upper part is in front of the light source, ie the main forward of the light source. somewhere along the emission direction there may be a portion of the arranged sheath. From this another, with the term "main forward emission direction", to the main optical axis of the light source A direction that is parallel and points away from the light source is meant. For example, for a conventional LED, the main forward emission direction is It could be the emission direction where the density peaks. of the light source, several LEDs may contain several sub-light sources with non-parallel optical axis, such as will be appreciated, where the main forward emission direction is the lower group of light sources. a direction that points parallel to the optical axis and away from the lower group of light sources it could be.

According to one embodiment of the present invention, the sheath is the scattering of light at the top of the sheath. Aside from], it can be adapted to be higher. Therefore, the cover a higher degree of scattering occurs in the upper part of the may come. The current practice is that the light striking the side of the upper part of the sheath transmit a smaller percentage (from the light source) and transmit a larger percentage It is advantageous in terms of its reflection (backwards and sideways). Thus, the light density, partially backwards and sideways in the main forward emission direction of the upper part] reflecting more light than emitted light and partially side to side] and more striking light in the backward directions (compared to the main forward emission direction) (light emitted by both the light source and reflected by the upper part) increases sideways and backwards due to transmission.

The side] part is mostly sideways from the light source] and backwards (main be part of the sheath struck by the light emission (according to the forward emission direction) will be appreciated. The lateral portion can also be used as a side wall of the sheath. can be named. 3628933 According to one embodiment of the present invention, the upper part is at least 10%, preferably 2571%. and even more preferably at least 50% permeability. Because, the upper part shall contain at least 10%, preferably 25%, of the light striking the upper part. can be adapted to transmit. The current implementation, via the upper part, transmission is sufficiently visible in any dark area on the cover. it is advantageous in terms of reducing, it gives the sheath more uniformly luminous and It makes the light intensity distribution more uniform. Also, the upper part, the upper part most of the rest of the striking light, for example 90% of the light, 75% reflecting light that is not transmitted outside), can be adapted to reflect, this light density distribution is more uniform and the lighting device has a bright It is advantageous in that it resembles an electric light bulb better.

According to one embodiment of the present invention, the scattering properties (or scattering strength, size or level), towards the lateral part of the sheath gradually decreases, which makes the transition between the upper part and the side] more It is advantageous in terms of being smooth (or less sharp). Because, with the current application, it appears on the cover, in the transition between the top and the lateral part the appearance of edges is prevented and the light intensity distribution in the near field is more it is smooth.

According to the present invention, the upper portion may contain scattering particles. scattering particles The upper part provides scattering properties and the upper part is used to scatter light striking it. is adapted. Optionally, also the side of the sheath (or the remainder), may contain scattering particles, light emitted in the sideways and backward directions It can be advantageous in terms of scattering the light from its source, the light Reduces the light that shines from the source.

In one example, the concentration of scattering particles is at the top of the sheath. may be higher than the lateral part. Therefore, the lighting device The density distribution is the concentration of the scattering particles throughout the sheath. 3628933 can be adjusted by changing The higher scattering particles in the upper concentration provides an increased reflection of light in lateral and backward directions.

In applications, scattering particles may be arranged on an interior surface of the sheath, so that the light is reflected backwards and laterally, surface scattering in the upper part is obtained with. For example, the inner surface of the upper portion may be covered with scattering particles.

Optionally, the scattering particles can also they can also be arranged on the inner surface. According to one embodiment, scattering particles are they can be arranged in a scattering layer on an inner surface of the sheath, so that light intensity distribution of the lighting device can be adjusted by changing the scattering properties. For example, the scattering layer is can be provided with the apertures (or holes) pattern, where less scattering is desired. parts of the sheath from which the scattering layer (or no scattering can be provided with more and/or larger openings and parts of the sheath where more scatter is desired (for example, at the top), scattering can be provided with smaller and/or fewer openings in the layer. A In practice, the light intensity distribution of the lighting device, the scattering along the sheath can be adjusted by changing the thickness of the layer. The scattering layer is then may be thicker in the lateral portion of the sheath than in the lateral portion of the sheath.

According to the invention, the scattering particles are embedded in the sheath, so that the light backs up. its correct and lateral reflection is achieved by volume scattering in the upper part. For example, the sheath is made of a light-transmitting material in which the scattering particles are embedded. can be made, where the local concentration of scattering particles in the sheath and the local thickness of the sheath is adapted to create the upper part redirection.

The concentration of scattering particles within the sheath is uniform (or homogeneous), the thickness of the sheath, the light intensity distribution of the lighting device to set it up and create the redirection of the top of the sheath. replaceable. The present invention suggests that the sheath, for example, is uniformly spread and 3628933 a transparent material (such as glass or plastic) with embedded scattering particles It can be manufactured as a single piece of material.

According to the present invention, the upper part of the sheath is thicker than a lateral part of the sheath. For example, if the concentration of scattering particles is uniform in the sheath, in the upper To provide higher (or more) scattering on the lateral part, the upper part preferably thicker than the lateral portion. According to another example, the upper may be thicker, but also that the scattering particles have a higher density than the lateral part. so that the light in the lateral and backward directions density increases even more.

According to another embodiment of the present invention, the upper part is the total interior reflection (TIR) part of the light from the light source (laterally and backwards) through reflect, so that the scattering properties of the upper part are provided by the TIR can be adapted to reduce the need for scattering particles. In one application, the top The section may contain prism-shaped elements to provide TlRii. Prism shaped elements, such as prism-shaped grooves and they can be obtained with protrusions, these grooves and protrusions eg circumferential, hexagonal They may be arranged radially or radially (or any other suitable can be edited below).

According to another embodiment of the present invention, the lighting device is of tube type or It may be of the bulb type. Accordingly, the sheath is tubular (or light, respectively). a longitudinal opening in the sources and where the light sources are mounted tube with any base) or ampoule it could be. In current applications, the top is in front of the light source (i.e. the main forward may be part of the bulb or tube-shaped sheath arranged in the direction of

In one embodiment, the light source may be a solid state light source such as an LED. This kind light sources, laterally and at a higher light than backwards they can provide a directed light with its intensity, which is thus solid state light 3628933 part of the light from its source laterally through the upper part of the sheath and can be compensated for by backward scattering.

I believe the invention relates to all possible combinations of properties set forth in the claims. attention should be paid. Other objects, features and advantages of the present invention, The following detailed descriptions, figures, and appended prompts will become clear upon review. will be. Those skilled in the art will appreciate the different features of the present invention, that they can be combined to create applications other than those described below. they notice.

BRIEF DESCRIPTION OF THE FIGURES These and other aspects of the present invention are now appended, showing applications of the invention. will be described in more detail with reference to the figures.

Figure 1A shows a side view of a prior art lighting device. is the view.

Figure lB is a top view of the lighting device shown in Fig. lAs. is the view.

Figure 2A illustrates a lighting device according to one embodiment of the present invention. shows.

Figure 2B is an illumination according to another embodiment of the present invention. displays your device.

Figures 3A to 3E, lighting according to different embodiments of the present invention. shows the light intensity distribution of the devices.

Figures 4A and 4B are lighting according to different embodiments of the present invention. shows the light intensity distribution of the devices.

Figures 5A and SB are lighting according to different embodiments of the present invention. shows the light intensity distribution of the devices.

Figure 6 is an illumination according to yet another embodiment of the present invention. displays your device. 3628933 Figure 7A is an illumination according to yet another embodiment of the present invention. displays your device.

Figure 7B is a cross-section of the lighting device shown in Figure 7A. It is an enlarged view.

Figure 8A shows a tube-type lighting according to an embodiment of the present invention. displays your device.

Along line AA of the lighting device shown in Figure SB, Figure 8A. shows a cut cross-section.

Figure SC shows the light of a neon tube lighting device according to the prior art. Figure 8D shows the light of an LED tube illuminator according to the prior art. The light intensity of the lighting device shown in Figure 8D, Figure 8A shows the distribution.

Figure 9 illustrates a lighting device according to one embodiment of the present invention. shows.

All shapes are schematic, need no scaling, and generally just they show the parts needed to explain the invention, here are the other parts they can be removed or simply recommended.

DETAILED DESCRIPTION OF THE INVENTION Referring to Figures 1A and IE, a lighting device according to the prior art will be defined.

Figure 1A with a bulb-shaped sheath 120 arranged on a horizontal base 145 a lighting containing an enclosed light source llO (including several LEDs) Shows a 1 side view of the device. Light source 110, lighting pointing 100 parallel to the optical axis of the device and 110 away from the light source. it has a main forward emission direction 10 . In the upper part of the sheath 120, the light 3628933 from the source 110 laterally and backwards light 'on' from the base 145 to compensate for the shading effect caused by the light from the light source 110 lateral A reflector 125 is arranged for reflecting as and backwards. Reflector 125 however, Figure lBade shows the lighting device l from the top. As such, it provides a dark field 126 at the top of the sheath 120, which is the dark field 126, the light 125 a reflector, which reflects almost 100% of the light coming from its source 1 10 is the result. Since dark area 126 is blocked in the light main forward emission direction, that the lighting device 1 resembles a conventional bright electric light bulb. besides, it distorts the light intensity distribution of the lighting device in the near field.

With reference to Figures 2A and 2B, a lighting device will be defined.

Figure 2A is a sheath, preferably bulb-shaped, arranged on a base plate 245. A light source 210 containing several LEDs 215 surrounded by 220 shows a cross-section of the lighting device 2 . LEDs 215, lighting 215 of the LEDs 215 substantially parallel to the optical axis 200 of the device 2 It has a main forward emission direction 20 pointing away. Lighting device 2 Optionally, to connect the lighting device 2 in a lamp connection and the light source 210 used to operate the light source 210 and may include a screw base 250 for cooling the electronics (not shown).

Sheath 220 includes an upper section 225 arranged in front of the light source 210 such that light emitted from the two light sources 210 substantially in the main forward emission direction 20, the upper part hits 225. The Sheath 220 also extends from the light source 210 to a greater extent. the light emitted in the lateral direction is arranged to strike on the side] section 227 a lateral portion (or sidewall) 227. Top 225, sideways] and back reflecting a piece of light that multiplies correctly (as indicated by arrows 25) and scattering properties to transmit a piece of light that strikes the outside of the sheath 220 has. The lateral and backward reflection of the light, the 2 lights of the lighting device increases its intensity in the lateral and backward directions, whereas the upper part of the light is 225 3628933 transmission along still provides 2 forward light emission from the lighting device which reduces the dark field obtained in the prior art (shown in Figure 1B).

Preferably, top 225, at least 10% of the light hitting the top, or even more preferably at least 25% of it is transmitted through the upper part 225 adaptable. A transmittance of 10%, 220 in the case can cover any dark area. may be sufficient to significantly reduce the visibility of permeability can give the appearance of a fully burned light bulb. Other than that, lateral so that section 227 has a higher permeability than the top section 225. adaptable. For example, the lateral section 227 has 80%, 90%, or it can even be adapted to transmit up to almost 100%. Optional As a result, scattering levels 225 in the upper part, 225 in the upper part and 227 in the lateral part 227 towards the lateral part to provide a smooth transition between as may decrease.

The ratio of transmitted and retroreflected light, 225 scattering in the upper it depends on the amount and the area of 225 of the upper part. Light as in the previous technique laterally and backwards using a reflector that reflects almost 100% To obtain a similar light intensity in the directions, the 225 area of the upper may be larger than the area of the reflector. For example, top 225, total sheath It can cover approximately 25-50% of the area, for example 40%.

Another design parameter of the lighting device is the upper part 225 diameter (or is the ratio between the maximum sheath diameter) and the heat sink 240. Diameter of heat sink the smaller it is compared to the maximum sheath diameter, the more light heat It is allowed to pass sideways] and backwards into the reducer, and in the upper part The more scattering required to obtain a more uniform light intensity distribution, the more less. Therefore, the scattering properties of the upper part 225 result in a more uniform light. to the design of the sheath and the size of the heat reducer to ensure density distribution. can be adapted accordingly. Yet another design parameter, the heat sink is reflectivity. If the reflectivity is low, more light is added to the lateral part. quantify the amount of light striking it and thus reflected laterally and backwards. It can preferably be reflected by the upper part 225 to increase it. If the reflectivity is too 3628933 if it is high, less light needs to be reflected by the upper part 225. For example, the design of the sheath (and top) and the heat sink, the top light It will transmit approximately 25-50% of the light from its source and the rest of the light (except for loss of light absorption) can be adapted to radiate from the side.

In current applications, scattering, which may be called volume scattering, properties are obtained by scattering particles embedded in the sheath 220. Scattering particles, for example, in a transparent material (e.g. glass, plastic or silicon) can be embedded titanium dioxide (TIOZ) particles.

Preferably, at the same time, the lateral portion 227 is irradiating the glare light from the light source 210. May have scattering properties to reduce 2 lights of the lighting device The density distribution spatially identifies the scattering features across sheath 220. can be adjusted by changing the scattering is obtained. In current embodiments, such adjustment may be required to ensure that the sheath 220 (wall) can be obtained by changing its thickness (spatially), such that more parts where scattering is desired are those where scattering is less desirable it is thicker. For a given concentration of scattering particles, the coarser A sheath wall has more scattering per unit area than a thinner sheath wall. contains the particle. Adjustment can also (alternatively or supplementally) by changing the concentration (spatially) of the scattering particles in can also be obtained, such that the parts where more scattering is desired a higher scattering particles from parts where it is less desirable has concentration. For a given sheath thickness, a higher scattering A fraction with a particle concentration is lower per unit area. contains more scattering particles than a fraction with a higher concentration. For example, the upper part 225 may be thicker than the lateral part 227 and/or a higher can have a scattering particle concentration. Also, scattering particles scattering properties depend on the size of the particles and between the size of the particles and the wavelength of the light coming from the light source 210 may be related. 3628933 Furthermore, the shape of the upper part 225 (especially the inner surface) is oriented sideways and backwards. can be adapted to influence the beam angle of the light that is correctly reflected. Figures 2A and Illumination devices 2 shown in 2D are identical except for the shape of the upper parts 225, 235. they may be. In both applications, the upper parts of the cover 220, 225, 235, to get more scattering from sections 227 than [225, 235 sides] in sections, 227 thicker than the lateral part. In the embodiment shown in Figure 2A, the upper part 225, since a less complex shape has to be manufactured, the manufacturing point of view It has a (largely) uniform thickness, which may be advantageous in terms of Shape In the embodiment shown in 2B, the top 235 is from the top of the sheath to the light source 210. has the shape of a cone (or conical) that extends towards It can be advantageous to achieve increasing light intensity backwards. In particular, the light its density is increased in the lateral directions, which results in a higher optical efficiency. less light is reflected or absorbed against the baseplate is advantageous.

With reference to Figures 3A and 3E7, as described with reference to Figure 2A a calculated light intensity distribution of a designed lighting device will be defined. In Figures 3A to 3E, optical axis with reference mark 300 shown and the main forward emission direction is substantially parallel to the optical axis and points upwards in figures. In the calculations, the scattering particles concentration (in this case, TiO 2 particles), 003an% in sheath 220 it shows the light intensity distribution 301 as obtained with the concentration, Figure 3D light as obtained with a 0.067% concentration of scattering particles shows the density distribution 302, Figure 3C shows a 0.09% of the scattering particles shows the light intensity distribution 303, as obtained with the 3D light as obtained with a concentration of 0.12”1 % of scattering particles 304 shows the density distribution, Figure 3E, a 0.15.1% of scattering particles 305 shows the light intensity distribution as obtained with the concentration of 305.

As can be seen in Figures 3A to 3, the light in the main forward emission direction 3628933 light intensity in the lateral and backward directions, while the intensity decreases slightly, increases with an increasing concentration of scattering particles.

With reference to Figures 4A and 4B, with reference to Figure 2A, only the cover with a uniform thickness (ie top and side parts of the same thickness) a measured light intensity of a lighting device designed as described distribution will be defined. In Figures 4A and 4B, optical axis reference mark 400 shown and the main forward emission direction is substantially parallel to the optical axis and points upwards in figures. Figure 4A, TiO scattering in the sheath light intensity as obtained with a 0.0`15”1k concentration of particles 401 and Figure 4B shows the distribution of TiO2 scattering particles in the sheath. shows. Laterally and backwards, as can be seen in Figures 4A to 4B. The light intensity in the directions (relative to the main forward emission direction), the higher the scattering. relatively more for a lighting device with a concentration of particles. is high.

With reference to Figures 5A and 5B, with reference to Figure 2A (i.e. upper part thicker than the lateral part) of a lighting device designed as described A measured light intensity distribution will be defined. In Figures 5A and 5B, optical the axis is indicated by the reference mark 500 and the main forward emission direction is with the optical axis. parallel and point upwards in figures. Figure 5A, TiO2 at the top light as obtained with a concentration of 0.015% of scattering particles shows the density distribution 501 and Figure 5B shows the TiO2 scattering in the upper light intensity as obtained with a 0.12% concentration of particles shows the 502 distribution. Laterally and backwards, as can be seen in Figures 5A to 5B. The light intensity in the right directions (relative to the main forward emission direction) is higher. for lighting device with scattering particles concentration greatly is higher. Also, Figure the light intensity distribution shown in Figure 4B. Comparing with the light intensity distribution shown in section 5, if the top 3628933 scattering at a higher concentration than the thicker and side particles, in the sideways] and backward directions (to the main forward emission direction indicates that the light intensity is substantially higher.

Referring to Figure 6, a lighting according to another embodiment of the present invention device will be identified. Illumination described with reference to Figure 6 The basic structure and working principle of the device, obtained by surface scattering Except for the scattering features, which will be described in detail below, Figure 2A, or The basic structure and operation of the lighting device described by reference may be identical with the principle. an illumination comprising a light source 610 containing several LEDs 615 surrounded indicates device 6. In current practice, scattering particles (for example TiO2 particles) are provided in a layer 621 on the inner surface of the sheath 620 such that the upper The scattering properties of the section 625 are obtained by surface scattering. scattering layer 621 includes a point model with scattering particles. With this, scattering layer 621, scattering fields and any non-scattering fields may have the appropriate model. Scattering properties of the scattering layer, model the density (or area) of the scattering fields and/or the scattering can be adjusted by changing the thickness of the fields. In the present example, since the sheath 620] partial 627 is not provided with any scattering layer, whereas the scattering top 625 in the part] is 627 higher than the part. However, the scatter layer 621, alternatively on the side], may extend down to 627, where the thickness of the scattering layer and/or the density of the scattering layer, lower 627 on the side to get a scatter] 625 lower than the top it could be. According to another example, a scattering layer (any model not), can be applied to the top and to the side, where the scattering layer is may be thicker than the side] part. For example, with reference to Figure 6, modeled instead of the upper part being 625 patterned, it is a uniform applied inside (and/or dista) may have a scattering layer and side] section 627 also inside (and/or dista) may have an applied (uniform) layer of scattering, here to the side]10 3628933 The 627 scattering layers in the upper part are stronger than the 625 scattering layers in the upper part. it is thin.

In one embodiment, the lighting device 6 illuminates some lights from the light source 610 laterally and adapted to reflect in backward directions (relative to the main forward emission direction) an additional optical element 660 having an upper portion 665. 660 top of the optic section 665, so that the upper part of the sheath 620 can provide a similar effect as 625 and It can provide additional redirection of light in lateral and backward directions.

The upper part of the additional optical element 660 665, for example the volume as described above by scattering or surface scattering or by total internal reflection (hereinafter will be explained) may have scattering properties that can be provided. For example, optics piece 660 may be dome shaped. The current application, other identified It will be appreciated that it can be combined with any of the applications. Optional as the lighting device 6 (or one of the predefined lighting devices) any one), for example, through the 6 colors of the lighting device, for example, through the phosphor The additional optics may include a filter arranged in the 660 to adjust it.

Referring to Figures 7A and 7B, according to another embodiment of the present invention, a lighting device will be defined. With reference to figures 7A and 7B9 The basic structure and working principle of the described lighting device, the total interior scattering obtained by reflection (TIR), which will be described in detail below of the lighting device described with reference to Figure 2A3, except may be identical with its basic structure and working principle. an illumination comprising a light source 710 containing several LEDs 715 surrounded displays the device 7. In the present embodiment, the upper part 725, prism-shaped elements 729 (Figure 725 also showing an enlarged view of the upper part) 7B), such that the scattering properties of the upper part 725 are TIR is obtained with. As an example, the light from the light source 710 striking the upper part 725 a light ray A is transmitted by the boundary between the sheath and the surrounding air. 3628983 strikes the prism-shaped elements 729 at an angle that causes it to be reflected, such that Ray A is reflected in the lateral and downward directions. 710 from light source another light ray B is transmitted (rather than reflected) through upper section 725 strikes the prism-shaped elements 729 at an angle that causes prism shaped elements 729 can be any shape such as circular (peripheral), hexagonal, or radial pattern. they can be arranged in the form of a suitable model. Optionally, sheath 720, prism an outer (preferably clear) cover 728 to protect shaped elements 729 from damage may contain.

Referring to Figures 8A and 8B, according to another embodiment of the present invention, a lighting device will be defined. With reference to Figures 8Aiya and 8Bly The basic structure and working principle of the described lighting device, lighting described with reference to Figure 2A, except that the device is of the tube type. It may be the same as the basic structure and working principle of the lighting device.

Figures 8A and 8B show a main forward emission direction 80 along an optical axis 800. (showing a cross-section taken along line A - A in Figure 8A) surround a light source 810 containing several LEDs (as shown in Figure 8B). shows a tube-type lighting device 8 comprising a tubular sheath. Preferably, a heat sink 840 is arranged adjacent to the light source 810 and a reflector 870 to cover the attenuator 840 and the light from the light source 810 outside the sheath 820. edited to reflect. Furthermore, sheath 820 has scattering properties. part of the light coming from the light source 810 to the side] and back includes an edited top section 825 to reflect accurately. scattering properties, for example volume scattering, surface scattering, with TIR or can be obtained by any combination of these. Preferably, sheath 820 is on the top It can be adapted to obtain 827 more scattering from 825 lateral sections.

Referring to Figures 8C to 8E, prior art tube-type lighting devices and 8 light intensity distribution of the lighting device according to the current application will be defined. In Figures SC to 8E, the optical axis of the lighting devices is 3628933 indicated by the reference mark 800 and the main forward emission direction is largely optical. is parallel to the axis and points upwards in figures. Figure 8C, previous light intensity of a neon (or fluorescent) tube-type luminaire according to the technique shows the distribution 801. Light intensity distribution 801 around the tube circumference it is uniform. Figure 8D, prior art (any upper scattering 802, the light intensity distribution of an LED tube-type lighting device (without shows. The light intensity distribution 802 is more in the main forward emission direction of the LEDs. higher, but lower in the lateral directions and zero in the backward directions.

Low lateral and backward light intensity, mainly lateral and backward from the heat sink (of the LEDs) that shadows the light from the LEDs in the required for cooling) is caused. Figure 8E is an LED according to the current application. 803 shows the light intensity distribution of the tube type lighting device. Figures SC As can be seen by comparing the 8E to 8E, the light intensity of the current application its distribution is substantially higher 803, sideways and backwards, and Therefore, when compared to the traditional LED tube type lighting device, it is more is uniform (and more versatile) and a traditional neon (or fluorescent) tube It better resembles the light intensity distribution of the 801 type lighting device.

Furthermore, the lighting device is an LED module (defined in the independent may have features). Several such LED modules 9 are shown in Fig. It can be connected to each other with a light emitting object such as Preferably, LED 9 modules, The forward emission directions of the LED modules 9 are 90 different directions. they can be edited. For example, a common heat sink 940 connects the LED modules 9 together. can bag. Each LED module has a main forward emission direction 90 (light the optical axis 910 is parallel to 900) and the light source 910 is arranged. a light source 910 having a sheath 920. Sheath 920, scattering a part of the light coming from the light source 910, which has the characteristics of reflecting laterally and backwards relative to the emission direction 90 and light an upper part arranged to transmit a portion of the light from the source 910 Contains 925. 3628933 DETAILED LIST OF APPLICATIONS 1. Having a light source and a wall thickness and a top a lighting device comprising a cover, said cover substantially down at least a part of the light that hits the piece. scattering properties that redirect in the direction and transmit the rest of the light It has an inner surface provided by distribution is obtained. 2. According to the item, it is a lighting device, where scattering particles, obtained by providing the wall with a concentration of scattering particles. 3. The item is a lighting device according to 1 or scattering properties are changed by changing the wall thickness of the sheath. 4. Item 1 is a lighting device according to 2 or 3, where scattering is The concentration of particles is kept constant on the wall. . Item 1 is the lighting device according to 2 or 3 where scattering is The concentration of particles is increased at the peak. 6. It is a lighting device according to any of the previous items, its characteristic feature is that at least 10% of the sheath's light transmitting from within.

The person skilled in the art considers the present invention to be the preferred preferred realizes that it is not limited in any way with applications. On the contrary, the attached Many changes and variations are possible within the scope of the claims. Figures 2A and the applications defined with reference to 2D, especially the permeability of the upper part and The existing applications of the gradual transition of the scattering properties of the upper It would be appreciated if it could be applied in any of the other embodiments of the invention. will be. In addition, surface scattering, volume scattering and total internal reflection applications may be combined in any suitable way.

Claims (1)

REQUESTS . An illuminating device (2) comprising: - a light source 210 with a main forward emission direction 20 and - a shield 220 in which the light source is arranged, and wherein the shield has scattering properties and comes from the light source. It includes an upper part (225) arranged to reflect a part of the light laterally and backward with respect to said main forward emission direction and transmit a part of the light from the light source, characterized by the scattering particles embedded in the sheath, the uniformity of the concentration of scattering particles in the sheath. and therefore the top of the sheath is thicker than a lateral portion of the sheath. . The lighting device as defined in claim 1, wherein the sheath is adapted such that the scattering of light is higher than [227] at the top of the sheath. . The lighting device as defined in claim 1 or 2, wherein the upper part has a transmittance of at least 10%, preferably at least 25%, and even more preferably at least 50%. . The lighting device as defined in any one of the preceding claims, wherein the scattering Properties of the upper portion gradually decrease towards the side of the sheath. . The lighting device as defined in any one of the preceding claims, wherein the scattering particles are arranged on an inner surface of the sheath. 3628933 The lighting device as defined in any one of the preceding claims, wherein the scattering particles are arranged in a scattering layer (621) on an interior surface of the sheath. The lighting device as defined in claim 6, wherein the scattering layer is thicker than the scattering layer at the top of the sheath. The lighting device as defined in any one of the preceding claims, wherein the upper part is adapted to reflect a portion of the light from the light source by means of total internal reflection. The lighting device as defined in claim 85, wherein the upper portion includes prism-shaped elements (729) to provide said total internal reflection. The lighting device as defined in any one of the preceding claims, wherein the lighting device is of the tube type or the bulb type.